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 TM 55-1905-242-14
OPERATOR, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE
FOR LANDING CRAFT, MECHANIZED (LCM-8) (ALL VESSELS WITH MOD 2 APPLICATION)
THEORY OF OPERATION
FIRE SUPPRESSION SYSTEM
GENERAL
The LCM-8 Mod 2 is fitted with an engine room fire suppression system. This system is a manually-actuated, stand-alone,
total flooding fire suppression system. The system is capable of extinguishing Class A, Class B, and Class C fires when
properly deployed. The system consists of a storage cylinder, FM-200 extinguishing agent, control head, discharge nozzle,
and pull box.
STORAGE CYLINDER
A steel storage cylinder, mounted in the port stowage locker, stores the FM-200 extinguishing agent until it is needed. The
cylinder has a volume of 1.000 ft (0.0283 m) and holds 70 lb (31.8 kg) of liquid FM-200 superpressurized with nitrogen to 360
lb/in (24.8 bar).
ENGINE ROOM
PORT SIDE
MAIN ENGINE
STORAGE
CYLINDER
(IN PORT
STOWAGE
LOCKER)
DISCHARGE NOZZLE
DISCHARGE
(IN ENGINE ROOM)
PIPING (TYP.)
STBD SIDE
MAIN ENGINE
FIRE SUPPRESSION DISCHARGE PIPING
FM-200 EXTINGUISHING AGENT
FM-200 is a colorless, odorless, electrically nonconductive, environmentally friendly gas. It suppresses fire by a combina-
tion of chemical and physical mechanisms without affecting the available oxygen, allowing personnel to leave the fire area
safely. FM-200 is stored in the storage cylinder as a liquid, superpressurized at 360 lb/in at 70 F (24.8 kg at 21.1 C) by dry
nitrogen. The superpressurization improves FM-200's discharge characteristics.
0013 00-1
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